Patents Assigned to Minnesota High-Tech Resources
  • Patent number: 6565542
    Abstract: Apparatus and methods for injecting fluid into the epidural space. An improved epidural needle or cannula is provided having a distal bulge or flare located within a few millimeters of the distal tip. The distal flare provides an increased resistance to penetration while the needle is penetrating the ligamentum flavum, and a decrease in resistance to penetration after the distal flare has successfully penetrated the ligamentum flavum. In a preferred embodiment, the distal bulge begins proximally at a distance of less than about 6 millimeters from the distal tip. The epidural needle according to the present invention preferably has the distal bulge or flare beginning proximally at a distance from the distal tip of less than the width of the epidural space.
    Type: Grant
    Filed: June 22, 2001
    Date of Patent: May 20, 2003
    Assignee: Minnesota High-Tech Resources
    Inventors: Matthew M. Kumar, Larry D. Johnson